Pencil sharpener



2 Sheets-Sheet 1 Filed Oct. 17, 1945 ATTORNEYS M W. 5 M

Sept. 26, 1950 J. s. MILNE PENCIL SHARPENER 2 Sheets-Sheet 2 Filed Oct.17, 1945 Uvvmroe JOHN 5 M/LNE A770/P/VEY5 Patented Sept. 26, 1.950

PENCIL SHARPENER Johns. Milne Chicagml llnassignpr to Sears,

Roebuck and 60., New'York Chicago, 111., a corporation of Applicationqctc ber 17, iai'slseriaiivo. 622,971

The present. invention relates to pencil sharp- I I.

eners and is more particularly concerned" with certain improvements inpencil sharpener design and apparatus for affording thev attainment of astreamline, esthetic product which includes ad- 7 justment for pencildiameter variations and severability for chafi discharge; V

V The principal object of the present invention is the attainment of apencil sharpener structure whose outer contours are gracefullystreamlined after the manner of aeronautic teardrop design and yet inwhich is incorporated all of the mechanical advantages and structuraldetails of adjustability, efficiency in performance and economy ofmanufacture,

Pencil sharpeners customarily are provided with a system of rotatablecylinder cutters con tained within a housing that provides a reservo'irfor the retention of cuttings or'cha'ff subject to periodic cleanout ordisposal. In addition, this class of apparatus in order to haveuniversal adaptability, must be provided with aperture adjustment so asto appropriately receive and secure various conventional diameters ofpencil structures'toward the end of achievingmoreiefficient andconcentrica1ly accurate cutting operations. Heretofore known-rnechanisins in which these functionally desirable features have beenincorporated possessed considerable irregularity of outline orcontour soas to la cking from an esthetic orartistic viewpoin @The manner inwhichthe desired structure'sare designed in the present embodimentcontributes" toward the attainment or a streamlining of the overallstruc ture whereby there is achieved higher standards of esthetic beautyand pleasing symmetry.

For a more comprehensive understanding of the present invention,reference will now be had to the accompanying drawings and to thefollowing detailed specification in which like references designatecorresponding parts throughout and in which: I

Fig. 1 is a perspective view of a mechanical pencil sharpening apparatusshowing the symmetry and esthetic lines of the outer structure such asis afforded by virtue of the mechanical features embodied in the presentinvention,

Fig. 2 is a side elevation view partially in section of the apparatusfeatured in Fig. l'revealing the interior structure,

Fig. 3 is a plan View of the same apparatus having portions broken awayin order to reveal interior features of the construction, and

Fig. 4 is a transverse sectional View taken ap-' proximately on the line44 of Fig. 2.

Fig. 5 is a sectional view taken approximately on line 5-5 of Fig. 2.

The reference numeral II indicates generally a pedestal'casting'the foot12 of which is gracefully curved and filleted with the integral verticalpost [3, as best indicated in Figs. 1 and 2. With the latter there isintegrally associated at its uppermost. extremity a journal ring l4, theouter lines of which form part of the bullet nose or streamlineconformation completed in the adjacent threaded collar. l5 of the. crankarm Hi. The

. journal or bearing ring M is centrally apertured as at l to receivethe principal or bearing portion of a shaft f8 which is confined endwisebeturning of the assembly with minimum endwise tween the abutment of itsenlarged diameter head [9' and the limit collar I5. i in reduceddiameter of shaft I8 is threaded as at 22 into the collar l5 so thatwhen the latter is drawn taut, its shoulder 2| engaging the adjacent endsurfaces of the bearing portion l8, adequate clearance will be affordedfor the easy shoulder 2| of the threaded play or clearance. The rotor,which is integral with the head {9, includes a convention cage cast 7ing comprising the for-e portion 23 having a con- I centricopeningzlarge enough to receive the maxi mum diameter of pencil and thepair of supporting flanges 24 and 25 Within which are received the endsof the cuttershafts after the manner of conventional structure of thisclass of apparatus. The two shafts converge toward the rotor axisand-are threaded into the head 19" giving support each to an associatedone of a 'pair'of cutters'26 and 21. i

The latter elements are preferably of a cylindrical mill cutter typehaving spirally fluted cut ting edges and integrally formed with beveledgear elements 2B'and 29 spaced from each other but meshing with aninternally toothed gear ring 3| which may be milled of flat stockmaterial and secured to the forward face 32 of the bearing.

ring I4. Upon rotation of the manual knob 33 and the arm IS, the entireassembly including the rotor cage '23, shaft [8 and threaded arm nut 15will revolve customarily in a counter-clockwise direction, as viewed inFig. 4, and through the engagement of the bevel gears 28 and 29 withoptionally at 90 therefrom in the case of wall or vertical surfacemounting of the pedestal l I. Toward this end the shoulder 35 may have apair of peripheral notches 58 and 69 and the=fitting ring 3'! may have alug 6'! insertable endwise into alter-n native ones of said notches, seeFig. 5. After the end ring 31 is placed upon the shoulder or undercut 35and the internally toothed gear ring 3| is positioned and secured, thehood 36 may not beremoved inadvertently and the'entire assemblyincluding the hood 36 will form an integral association. The hood 36which overlies the rotor assembly continues the outer streamline symmetry described above in connection with bush ing or sleeve I4 and nutand describes substantially 180 of barrel shapedcontour terminating athorizontal extremities in the curved edges 4|, of which one is visiblein Fig.1 and another in Fig.3, While just beneath these edges 41 thehood is provided with groovedguide flanges including the protruding lips42 and the groove recess 43, Fig. 1.

The forward face of the hood 36 is molded so as to present threealternative notches designated 44, 45 and 46 into one or another ofwhich there may be received a detent embossment 4'I, Fig. 4, of anescutcheon lever..48'which is pivotally supported at 49 on a shoulderscrew, 5| threaded into the body of the receptacle casting 52. The ,es.cutcheon lever 48 includes an arcuate segment 53 having three openingsdesignated 54, 55 and.

50 of different diameters each-for receiving an appropriate one of threeconventional pencil sizes when thelever 48 is characteristically placed,Fig. 4, in corresponding position, which position is detentably retainedby the engagement of the ridge embossment47 within one of the notches44, 45 or 46. I r vThe receptacle casting 52 affords a chamber 6| forcatching and retaining pencil shavings as they fall from the cutterelements '26 and 21 and its sidewalls 62 are provided with-guide-lips 63tion 66 may be hollowed out in those regions where rigidity and strengthare otherwise adequate.

While the present invention has been explained and described withreference to a particular structural embodiment, it is to be understoodnevertheless that various modifications and variations may be institutedwithout departing from the essential spirit or scope thereof.Accordingly, it is not intended to be limited to the particulars of theforegoing detailed specification, nor to the illustrations in theaccompanying drawings, but rather to be permitted a realm ofconstruction as indicated by the hereunto appended claim.

The invention claimed is:

A pencil sharpener assembly of the rotatable milling-cutter classcomprising a pedestal castmg formed with a journal for affording bearingsupport :tov the shaft of a milling-cutter cage and a foremostshouldered portion affording a ring with a shaft rotatable in saidpedestal journal,

and a shavings receptacle comprisinga unitary housing contoured tosupplement and continue the curvatures of said hood and having :lipsreceivable in said guide grooves of said hood, said receptacle includinga solid foremost section provided with a cylindrical aperture to receiveand support pencils directed to the milling cutters of said cage.

' JOHN S. MILNE.

REFERENCES CITED 5 The following references are of record in the file ofthis patent:

1 UNITED STATES PATENTS Number Name Date 1,285,528 Wilson Nov. 19, 19181,305,855 Wilson June 3, 1919 1,393,378 Johnson Oct. 11, 1921 1,609,538Cronan Dec. 7, 1926 1,810,284 Luppert June 16, 1931 2,094,549 MillerSept. 28, 1937 2,251,058 Hoffmann July 29, 1941 2,287,247 Hoffmann June23, 1942

